package com.example.filter;


import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;

import java.io.IOException;


@WebFilter("/*")
public class FilterDemo  implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //1.放行前，对request数据进行处理
        System.out.println("1. FilterDemo...");
        //放行
        chain.doFilter(request,response);
        //2.放行后，对response数据进行处理
        System.out.println("3. FilterDemo...");


    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {


    }

    @Override
    public void destroy() {

    }
}
